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Zhao Z, Cen F, Mo T, Li W, Ying Chen G. Chemical Constituents of a Marine-derived Fungus Fusarium oxysporum F0888 and their Antibacterial Activity. Chem Biodivers 2024; 21:e202400118. [PMID: 38349284 DOI: 10.1002/cbdv.202400118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Accepted: 02/13/2024] [Indexed: 03/01/2024]
Abstract
Five new compounds, including four hydroxyphenylacetic acid derivatives, stachylines H-K (1-4), a derivative of hydroxyphenylethanol (5), as well as seven known compounds were obtained from a marine-derived fungus Fusarium oxysporum F0888 isolated from sediments in the South China Sea. The structures and absolute configurations of new compounds were determined by spectroscopic (IR, NMR, and HR-ESI-MS) analyses, comparison of optical rotations, and the modified Mosher's MTPA ester method. Antimicrobial and anti-inflammatory activities of compounds 1-12 were tested. Unfortunately, all of isolated compounds were inactivity.
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Affiliation(s)
- ZhiYuan Zhao
- Key Laboratory of Tropical Medicinal Resource Chemistry of Ministry of Education and Key Laboratory of Tropical Medicinal Plant Chemistry of Hainan Province, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, Hainan, 571158, China
| | - FuLing Cen
- Key Laboratory of Tropical Medicinal Resource Chemistry of Ministry of Education and Key Laboratory of Tropical Medicinal Plant Chemistry of Hainan Province, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, Hainan, 571158, China
| | - TuXiang Mo
- Key Laboratory of Tropical Medicinal Resource Chemistry of Ministry of Education and Key Laboratory of Tropical Medicinal Plant Chemistry of Hainan Province, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, Hainan, 571158, China
| | - WanShan Li
- Key Laboratory of Tropical Medicinal Resource Chemistry of Ministry of Education and Key Laboratory of Tropical Medicinal Plant Chemistry of Hainan Province, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, Hainan, 571158, China
| | - Guang Ying Chen
- Key Laboratory of Tropical Medicinal Resource Chemistry of Ministry of Education and Key Laboratory of Tropical Medicinal Plant Chemistry of Hainan Province, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, Hainan, 571158, China
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Alanzi A, Elhawary EA, Ashour ML, Moussa AY. Aspergillus co-cultures: A recent insight into their secondary metabolites and microbial interactions. Arch Pharm Res 2023; 46:273-298. [PMID: 37032397 DOI: 10.1007/s12272-023-01442-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 02/28/2023] [Indexed: 04/11/2023]
Abstract
There is an urgent need for novel antibiotics to combat emerging resistant microbial strains. One of the most pressing resources is Aspergillus microbial cocultures. The genome of Aspergillus species comprises a far larger number of novel gene clusters than previously expected, and novel strategies and approaches are essential to exploit this potential source of new drugs and pharmacological agents. This is the first review consulting recent developments and chemical diversity of Aspergillus cocultures and highlighting its untapped richness. The analyzed data revealed that cocultivation of several Aspergillus species with other microorganisms, including bacteria, plants, and fungi, is a source of novel bioactive natural products. Various vital chemical skeleton leads were newly produced or augmented in Aspergillus cocultures, among which were taxol, cytochalasans, notamides, pentapeptides, silibinin, and allianthrones. The possibility of mycotoxin production or complete elimination in cocultivations was detected, which pave the way for better decontamination strategies. Most cocultures revealed a remarkable improvement in their antimicrobial or cytotoxic behavior due to their produced chemical patterns; for instance, weldone and asperterrin whose antitumor and antibacterial activities, respectively, were superior. Microbial cocultivation elicited the upregulation or production of specific metabolites whose importance and significance are yet to be revealed. With more than 155 compounds isolated from Aspergillus cocultures in the last 10 years, showing overproduction, reduction, or complete suppression under the optimized coculture circumstances, this study filled a gap for medicinal chemists searching for new lead sources or bioactive molecules as anticancer agents or antimicrobials.
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Affiliation(s)
- Abdullah Alanzi
- Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Esraa A Elhawary
- Department of Pharmacognosy, Faculty of Pharmacy, Ain shams University, Cairo, 11566, Egypt
| | - Mohamed L Ashour
- Department of Pharmacognosy, Faculty of Pharmacy, Ain shams University, Cairo, 11566, Egypt
- Pharmacy Program, Department of Pharmaceutical Science, Batterjee Medical College, 21442, Jeddah, Saudi Arabia
| | - Ashaimaa Y Moussa
- Department of Pharmacognosy, Faculty of Pharmacy, Ain shams University, Cairo, 11566, Egypt.
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3
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Hareeri RH, Aldurdunji MM, Abdallah HM, Alqarni AA, Mohamed SGA, Mohamed GA, Ibrahim SRM. Aspergillus ochraceus: Metabolites, Bioactivities, Biosynthesis, and Biotechnological Potential. Molecules 2022; 27:6759. [PMID: 36235292 PMCID: PMC9572620 DOI: 10.3390/molecules27196759] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 09/27/2022] [Accepted: 10/08/2022] [Indexed: 11/24/2022] Open
Abstract
Fungus continues to attract great attention as a promising pool of biometabolites. Aspergillus ochraceus Wilh (Aspergillaceae) has established its capacity to biosynthesize a myriad of metabolites belonging to different chemical classes, such as isocoumarins, pyrazines, sterols, indole alkaloids, diketopiperazines, polyketides, peptides, quinones, polyketides, and sesquiterpenoids, revealing various bioactivities that are antimicrobial, cytotoxic, antiviral, anti-inflammatory, insecticidal, and neuroprotective. Additionally, A. ochraceus produces a variety of enzymes that could have variable industrial and biotechnological applications. From 1965 until June 2022, 165 metabolites were reported from A. ochraceus isolated from different sources. In this review, the formerly separated metabolites from A. ochraceus, including their bioactivities and biosynthesis, in addition, the industrial and biotechnological potential of A. ochraceus are highlighted.
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Affiliation(s)
- Rawan H. Hareeri
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Mohammed M. Aldurdunji
- Department of Clinical Pharmacy, College of Pharmacy, Umm Al-Qura University, P.O. Box 13578, Makkah 21955, Saudi Arabia
| | - Hossam M. Abdallah
- Department of Natural Products and Alternative Medicine, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia
- Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt
| | - Ali A. Alqarni
- Department of Natural Products and Alternative Medicine, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia
- Pharmaceutical Care Department, Ministry of National Guard—Health Affairs, Jeddah 22384, Saudi Arabia
| | | | - Gamal A. Mohamed
- Department of Natural Products and Alternative Medicine, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Sabrin R. M. Ibrahim
- Department of Chemistry, Preparatory Year Program, Batterjee Medical College, Jeddah 21442, Saudi Arabia
- Department of Pharmacognosy, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt
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4
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Chen L, Li E, Wu W, Wang G, Zhang J, Guo X, Xing F. The Secondary Metabolites and Biosynthetic Diversity From Aspergillus ochraceus. Front Chem 2022; 10:938626. [PMID: 36092677 PMCID: PMC9452667 DOI: 10.3389/fchem.2022.938626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Accepted: 06/21/2022] [Indexed: 12/04/2022] Open
Abstract
Aspergillus ochraceus, generally known as a food spoilage fungus, is the representative species in Aspergillus section Circumdati. A. ochraceus strains are widely distributed in nature, and usually isolated from cereal, coffee, fruit, and beverage. Increasing cases suggest A. ochraceus acts as human and animal pathogens due to producing the mycotoxins. However, in terms of benefits to mankind, A. ochraceus is the potential source of industrial enzymes, and has excellent capability to produce diverse structural products, including polyketides, nonribosomal peptides, diketopiperazine alkaloids, benzodiazepine alkaloids, pyrazines, bis-indolyl benzenoids, nitrobenzoyl sesquiterpenoids, and steroids. This review outlines recent discovery, chemical structure, biosynthetic pathway, and bio-activity of the natural compounds from A. ochraceus.
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Affiliation(s)
- Lin Chen
- Comprehensive Utilization of Edible and Medicinal Plant Resources Engineering Technology Research Center, Zhengzhou Key Laboratory of Synthetic Biology of Natural Products, Zhengzhou Key Laboratory of Medicinal Resources Research, Huanghe Science and Technology College, Zhengzhou, China
| | - Erfeng Li
- Horticulture and Landscape College, Tianjin Agricultural University, Tianjin, China
| | - Wenqing Wu
- Horticulture and Landscape College, Tianjin Agricultural University, Tianjin, China
| | - Gang Wang
- Comprehensive Utilization of Edible and Medicinal Plant Resources Engineering Technology Research Center, Zhengzhou Key Laboratory of Synthetic Biology of Natural Products, Zhengzhou Key Laboratory of Medicinal Resources Research, Huanghe Science and Technology College, Zhengzhou, China
- Key Laboratory of Agro-Products Quality and Safety Control in Storage and Transport Process, Ministry of Agriculture and Rural Affairs, Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Jiaqian Zhang
- Horticulture and Landscape College, Tianjin Agricultural University, Tianjin, China
| | - Xu Guo
- Horticulture and Landscape College, Tianjin Agricultural University, Tianjin, China
| | - Fuguo Xing
- Key Laboratory of Agro-Products Quality and Safety Control in Storage and Transport Process, Ministry of Agriculture and Rural Affairs, Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Beijing, China
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Maithani D, Sharma A, Gangola S, Choudhary P, Bhatt P. Insights into applications and strategies for discovery of microbial bioactive metabolites. Microbiol Res 2022; 261:127053. [DOI: 10.1016/j.micres.2022.127053] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 03/12/2022] [Accepted: 04/26/2022] [Indexed: 10/25/2022]
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Chen X, Wei J, Tang J, Wu B. Two new prenylated glycine derivatives from the marine-derived fungus Fusarium sp. TW56-10. Chem Biodivers 2021; 19:e202100899. [PMID: 34957670 DOI: 10.1002/cbdv.202100899] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 11/30/2021] [Indexed: 11/10/2022]
Abstract
Two new prenylated glycine derivatives (2-(4-((3-methylbut-2-en-1-yl)oxy)phenyl)acetyl)glycine (1) and methyl (2-(4-((3-methylbut-2-en-1yl)oxy)phenyl)acetyl)glycinate (2), along with nine known compounds (3-11) were purified from the marine-derived fungus Fusarium sp. TW56-10. Their chemical structures were determined by spectroscopic evidence, including extensive nuclear magnetic resonance (NMR), high-resolution electrospray ionization mass spectroscopy (HRESIMS) data, infrared radiation (IR) and Ultraviolet spectra (UV). Compound 4 (8-O-methyl-fusarubin) exhibited cytotoxic activity with IC50 value of 11.45 μM for A549 cells.
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Affiliation(s)
- Xuexia Chen
- Zhejiang University, Ocean College, Yuhangtang Road, No.688, 310058, Hangzhou, CHINA
| | - Jihua Wei
- Zhejiang University, Ocean College, Yuhangtang Road, No.688, 310058, Hangzhou, CHINA
| | - Jinshan Tang
- Jinan University, College of Pharmacy, Shougouling Road, 337, 510632, Guangzhou, CHINA
| | - Bin Wu
- Zhejiang University, Ocean College, Yuhangtang Road, No.866, 310058, Hangzhou, CHINA
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Anh CV, Kang JS, Choi BK, Lee HS, Heo CS, Shin HJ. Polyketides and Meroterpenes from the Marine-Derived Fungi Aspergillus unguis 158SC-067 and A. flocculosus 01NT-1.1.5 and Their Cytotoxic and Antioxidant Activities. Mar Drugs 2021; 19:md19080415. [PMID: 34436253 PMCID: PMC8402063 DOI: 10.3390/md19080415] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 07/24/2021] [Accepted: 07/24/2021] [Indexed: 12/01/2022] Open
Abstract
Ten secondary metabolites, including a new grifolin analog, grifolin B (1); a new homovalencic acid derivative, 12-hydroxyhomovalencic acid (7); and a compound isolated from a natural source for the first time (9), along with seven known compounds, grifolin (2), averantin (3), 7-chloroaverantin (4), 1′-O-methylaverantin (5), 7-hydroxy-2-(2-hydroxypropyl)-5-pentylchromone (6), homovalencic acid (8), and bekeleylactone E (10), were isolated from two fungal strains. The structures of 1–10 were identified by detailed analysis and comparison of their spectroscopic data with literature values. Compounds 9 and 10 showed moderate cytotoxic activity against a panel of cancer cell lines (PC-3, HCT-15, MDA-MB-231, ACHN, NCI-H23, NUGC-3), with the GI50 values ranging from 1.1 µM to 3.6 µM, whereas 1 displayed a weak 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity without cytotoxicity against all tested cell lines.
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Affiliation(s)
- Cao Van Anh
- Marine Natural Products Chemistry Laboratory, Korea Institute of Ocean Science and Technology, 385 Haeyang-ro, Yeongdo-gu, Busan 49111, Korea; (C.V.A.); (B.-K.C.); (H.-S.L.); (C.-S.H.)
- Department of Marine Biotechnology, University of Science and Technology (UST), 217 Gajungro, Yuseong-gu, Daejeon 34113, Korea
| | - Jong Soon Kang
- Laboratory Animal Resource Center, Korea Research Institute of Bioscience and Biotechnology, 30 Yeongudanjiro, Cheongju 28116, Korea;
| | - Byeoung-Kyu Choi
- Marine Natural Products Chemistry Laboratory, Korea Institute of Ocean Science and Technology, 385 Haeyang-ro, Yeongdo-gu, Busan 49111, Korea; (C.V.A.); (B.-K.C.); (H.-S.L.); (C.-S.H.)
| | - Hwa-Sun Lee
- Marine Natural Products Chemistry Laboratory, Korea Institute of Ocean Science and Technology, 385 Haeyang-ro, Yeongdo-gu, Busan 49111, Korea; (C.V.A.); (B.-K.C.); (H.-S.L.); (C.-S.H.)
| | - Chang-Su Heo
- Marine Natural Products Chemistry Laboratory, Korea Institute of Ocean Science and Technology, 385 Haeyang-ro, Yeongdo-gu, Busan 49111, Korea; (C.V.A.); (B.-K.C.); (H.-S.L.); (C.-S.H.)
- Department of Marine Biotechnology, University of Science and Technology (UST), 217 Gajungro, Yuseong-gu, Daejeon 34113, Korea
| | - Hee Jae Shin
- Marine Natural Products Chemistry Laboratory, Korea Institute of Ocean Science and Technology, 385 Haeyang-ro, Yeongdo-gu, Busan 49111, Korea; (C.V.A.); (B.-K.C.); (H.-S.L.); (C.-S.H.)
- Department of Marine Biotechnology, University of Science and Technology (UST), 217 Gajungro, Yuseong-gu, Daejeon 34113, Korea
- Correspondence: ; Tel.: +82-51-664-3341; Fax: +82-51-664-3340
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8
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Mohamed EF, Awad G. Solar photocatalytic degradation of organic pollutants from indoor air using novel direct flame combustion based hollow nanocomposite of Pd/Anatase–Rutile TiO2 mixed phase and evaluation of the biocompatibility. ADV POWDER TECHNOL 2021. [DOI: 10.1016/j.apt.2021.05.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Mohamed EF, Awad G. Photodegradation of gaseous toluene and disinfection of airborne microorganisms from polluted air using immobilized TiO 2 nanoparticle photocatalyst-based filter. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:24507-24517. [PMID: 32307677 DOI: 10.1007/s11356-020-08779-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Accepted: 04/06/2020] [Indexed: 06/11/2023]
Abstract
Photocatalytic oxidation (PCO) has been described as an advanced technology to remove toxic volatile organic compounds (VOCs) and airborne microorganisms from indoor air environments. This technique is economic, stable, safe, and capable to remove a wide variety of organic contaminants under UV irradiation. This study presents a case study on the effect of a fabricated filter in the removal of toluene at 26 mg/L and disinfection of ambient air under a given operating condition. The principal goals of this study were to synthesize Ag nanoparticles/TiO2 filter for the first time via the deposition of Ag nanoparticles on a commercial immobilized TiO2 tissue sheet by impregnation technique and to investigate the performance of this prepared Ag/TiO2 tissue based filter system for toluene removal as well as to remove airborne microorganisms from indoor air. The results illustrated that under the experimental conditions, Ag/TiO2-based filter was able to disinfect well the microorganisms. The performance of Ag/TiO2 filter shows two different stages; the first one is a slight adsorption phase in dark with approximately 15% of toluene removal within 60 min. The second stage is a photooxidation phase under UV irradiation in which the toluene removal efficiency was significantly enhanced with extension of the operational time and reached 97% during this stage. Additionally, the Ag/TiO2 filter has a higher disinfection capacity of airborne microorganisms that completely removed to reach 100% after 300 min of application. This filter could be practically introduced as an effective system in industrial, hospital, and home applications for air purification. Graphical abstract.
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Affiliation(s)
- Elham F Mohamed
- Air Pollution Department, Environmental Research Division, National Research Centre, 33 EL Bohouth St., Dokki, Giza, 12622, Egypt
| | - Gamal Awad
- Chemistry of Natural and Microbial Products Department, Pharmaceutical and Drug Industries Research Division, National Research Centre, 33 EL Bohouth St., Dokki, Giza, 12622, Egypt.
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Bhetariya PJ, Prajapati M, Bhaduri A, Mandal RS, Varma A, Madan T, Singh Y, Sarma PU. Phylogenetic and Structural Analysis of Polyketide Synthases in Aspergilli. Evol Bioinform Online 2016; 12:109-19. [PMID: 27199544 PMCID: PMC4863872 DOI: 10.4137/ebo.s32694] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Revised: 12/09/2015] [Accepted: 12/13/2015] [Indexed: 12/15/2022] Open
Abstract
Polyketide synthases (PKSs) of Aspergillus species are multidomain and multifunctional megaenzymes that play an important role in the synthesis of diverse polyketide compounds. Putative PKS protein sequences from Aspergillus species representing medically, agriculturally, and industrially important Aspergillus species were chosen and screened for in silico studies. Six candidate Aspergillus species, Aspergillus fumigatus Af293, Aspergillus flavus NRRL3357, Aspergillus niger CBS 513.88, Aspergillus terreus NIH2624, Aspergillus oryzae RIB40, and Aspergillus clavatus NRRL1, were selected to study the PKS phylogeny. Full-length PKS proteins and only ketosynthase (KS) domain sequence were retrieved for independent phylogenetic analysis from the aforementioned species, and phylogenetic analysis was performed with characterized fungal PKS. This resulted into grouping of Aspergilli PKSs into nonreducing (NR), partially reducing (PR), and highly reducing (HR) PKS enzymes. Eight distinct clades with unique domain arrangements were classified based on homology with functionally characterized PKS enzymes. Conserved motif signatures corresponding to each type of PKS were observed. Three proteins from Protein Data Bank corresponding to NR, PR, and HR type of PKS (XP_002384329.1, XP_753141.2, and XP_001402408.2, respectively) were selected for mapping of conserved motifs on three-dimensional structures of KS domain. Structural variations were found at the active sites on modeled NR, PR, and HR enzymes of Aspergillus. It was observed that the number of iteration cycles was dependent on the size of the cavity in the active site of the PKS enzyme correlating with a type with reducing or NR products, such as pigment, 6MSA, and lovastatin. The current study reports the grouping and classification of PKS proteins of Aspergilli for possible exploration of novel polyketides based on sequence homology; this information can be useful for selection of PKS for polyketide exploration and specific detection of Aspergilli.
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Affiliation(s)
- Preetida J Bhetariya
- Division of Plant Pathology, Indian Agricultural Research Institute, Pusa Campus, New Delhi, India
| | - Madhvi Prajapati
- Division of Plant Pathology, Indian Agricultural Research Institute, Pusa Campus, New Delhi, India
| | - Asani Bhaduri
- Cluster innovation Centre, University of Delhi, Delhi, India
| | - Rahul Shubhra Mandal
- Biomedical Informatics Center, National Institute of Cholera and Enteric Diseases, Kolkata, India
| | - Anupam Varma
- Division of Plant Pathology, Indian Agricultural Research Institute, Pusa Campus, New Delhi, India
| | - Taruna Madan
- National Institute for Research in Reproductive Health (ICMR), Mumbai, India
| | - Yogendra Singh
- Department of Zoology, University of Delhi, New Delhi, India
| | - P Usha Sarma
- Division of Plant Pathology, Indian Agricultural Research Institute, Pusa Campus, New Delhi, India
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Liu Y, Li QS, Zhu HL, Meng ZL, Xiang HY, Xie QH. Purification and characterization of two thermostable glucoamylases produced from Aspergillus niger B-30. Chem Res Chin Univ 2013. [DOI: 10.1007/s40242-013-3074-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Riaz M, Rashid MH, Sawyer L, Akhtar S, Javed MR, Nadeem H, Wear M. Physiochemical properties and kinetics of glucoamylase produced from deoxy-d-glucose resistant mutant of Aspergillus niger for soluble starch hydrolysis. Food Chem 2012; 130:S0308-8146(11)00920-4. [PMID: 24293795 DOI: 10.1016/j.foodchem.2011.06.037] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Glucoamylases (GAs) from a wild and a deoxy-d-glucose-resistant mutant of a locally isolated Aspergillus niger were purified to apparent homogeneity. The subunit molecular mass estimated by SDS-PAGE was 93 kDa for both strains, while the molecular masses determined by MALDI-TOF for wild and mutant GAs were 72.876 and 72.063 kDa, respectively. The monomeric nature of the enzymes was confirmed through activity staining. Significant improvement was observed in the kinetic properties of the mutant GA relative to the wild type enzyme. Kinetic constants of starch hydrolysis for A. niger parent and mutant GAs calculated on the basis of molecular masses determined through MALDI-TOF were as follows: kcat = 343 and 727 s-1, Km = 0.25 and 0.16 mg mL-1, kcat/Km (specificity constant) = 1374 and 4510 mg mL-1 s-1, respectively. Thermodynamic parameters for soluble starch hydrolysis also suggested that mutant GA was more efficient compared to the parent enzyme.
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Affiliation(s)
- Muhammad Riaz
- Department of Food Science and Technology, University College of Agriculture, Bahauddin Zakariya University, Multan, Pakistan ; Enzyme Engineering Lab, National Institute for Biotechnology and Genetic Engineering (NIBGE), P.O. Box 577, Jhang Road, Faisalabad, Pakistan
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Abstract
Microbial natural products continue to be an unparalleled resource for pharmaceutical lead discovery, but the rediscovery rate is high. Bacterial and fungal sequencing studies indicate that the biosynthetic potential of many strains is much greater than that observed by fermentation. Prodding the expression of such silent (cryptic) pathways will allow us to maximize the chemical diversity available from microorganisms. Cryptic metabolic pathways can be accessed in the laboratory using molecular or cultivation‐based approaches. A targeted approach related to cultivation‐based methods is the application of small‐molecule elicitors to specifically affect transcription of secondary metabolite gene clusters. With the isolation of the novel secondary metabolites lunalides A and B, oxylipins, cladochromes F and G, nygerone A, chaetoglobosin‐542, ‐540 and ‐510, sphaerolone, dihydrosphaerolone, mutolide and pestalone, and the enhanced production of known secondary metabolites like penicillin and bacitracin, chemical elicitation is proving to be an effective way to augment natural product libraries.
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Affiliation(s)
- Robin K Pettit
- Cancer Research Institute and Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287-2404, USA.
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15
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Petchkongkaew A, Taillandier P, Gasaluck P, Lebrihi A. Isolation of Bacillus spp. from Thai fermented soybean (Thua-nao): screening for aflatoxin B1 and ochratoxin A detoxification. J Appl Microbiol 2008; 104:1495-502. [PMID: 18194245 DOI: 10.1111/j.1365-2672.2007.03700.x] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIMS To study the interaction between Bacillus spp. and contaminating Aspergillus flavus isolated strains from Thai fermented soybean in order to limit aflatoxin production. To study the detoxification of aflatoxin B(1) (AFB(1)) and ochratoxin A (OTA) by Bacillus spp. in order to find an efficient strain to remove these toxins. METHODS AND RESULTS One A. flavus aflatoxin-producing strain and 23 isolates of Bacillus spp. were isolated from soybean and fresh Thua-nao collected from the north of Thailand. Inhibition studies of A. flavus and A. westerdijkiae NRRL 3174 (reference strain) growth by all isolates of Bacillus spp. were conducted by dual culture technique on agar plates. These isolates were also tested for AFB(1) and OTA detoxification ability on both solid and liquid media. Most of the strains were able to detoxify aflatoxin but only some of them could detoxify OTA. CONCLUSIONS One Bacillus strain was able to inhibit growth of both Aspergillus strains and to remove both mycotoxins (decrease of 74% of AFB(1) and 92.5% of OTA). It was identified by ITS sequencing as Bacillus licheniformis. The OTA decrease was due to degradation in OTalpha. Another Bacillus strain inhibiting both Aspergillus growth and detoxifying 85% of AFB(1) was identified as B. subtilis. AFB(1) decrease has not been correlated to appearance of a degradation product. SIGNIFICANCE AND IMPACT OF THE STUDY The possibility to reduce AFB(1) level by a strain from the natural flora is of great interest for the control of the quality of fermented soybean. Moreover, the same strain could be a source of efficient enzyme for OTA degradation in other food or feeds.
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Affiliation(s)
- A Petchkongkaew
- Laboratoire de Génie Chimique, UMR5503 (CNRS/INPT/UPS), Department Bioprocedes & Systemes Microbiens, ENSAT-INPT, Castanet-Tolosan, France
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Junker B, Walker A, Connors N, Seeley A, Masurekar P, Hesse M. Production of indole diterpenes by Aspergillus alliaceus. Biotechnol Bioeng 2006; 95:919-37. [PMID: 16878329 DOI: 10.1002/bit.21053] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Production of two related indole diterpenes (differing by a dimethyl leucine side chain) by Aspergillus alliaceus was improved through several pilot scale fermentations. Media were optimized through focus primarily on initial increases, as well as mid-cycle additions, of carbon and nitrogen sources. Fermentation conditions were improved by varying ventilation conditions using various combinations of air flowrate and back-pressure set points. Production improvements were quantified based on total indole diterpene concentration as well as the ratio of the major-to-minor by-product components. Those changes with a positive substantial impact primarily on total indole diterpene concentration included early cycle glycerol shots and enhanced ventilation conditions (high air flowrate, low back-pressure). Those changes with a significant impact primarily on ratio included higher initial cerelose, soybean oil, monosodium glutamate, tryptophan, or ammonium sulfate concentrations, higher broth pH, and enhanced ventilation conditions. A few changes (higher initial glycerol and monosodium glutamate concentrations) resulted in less notable and desirable titer or ratio changes when implemented individually, but they were adopted to more fully realize the impact of other improvements or to simplify processing. Overall, total indole diterpene titers were improved at the 600 L pilot scale from 125-175 mg/L with a ratio of about 2.1 to 200-260 mg/L with a ratio of about 3.3-4.5. Thus, the ability to optimize total indole diterpene titer and/or ratio readily exists for secondary metabolite production using Aspergillus cultures.
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Affiliation(s)
- B Junker
- Fermentation Development and Operations, Merck Research Laboratories, P.O. Box 2000, Rahway, New Jersey 07065, USA
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Atoui A, Dao HP, Mathieu F, Lebrihi A. Amplification and diversity analysis of ketosynthase domains of putative polyketide synthase genes inAspergillus ochraceus andAspergillus carbonarius producers of ochratoxin A. Mol Nutr Food Res 2006; 50:488-93. [PMID: 16715542 DOI: 10.1002/mnfr.200500165] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The diversity of polyketide synthase (PKS) genes in Aspergillus ochraceus NRRL 3174 and Aspergillus carbonarius 2Mu134 has been investigated using different primer pairs previously developed for the ketosynthase (KS) domain of fungal PKSs. Nine different KS domain sequences in A. ochraceus NRRL 3174 as well as five different KS domain sequences in A. carbonarius 2Mu134 have been identified. The identified KS fragments were distributed in five different clusters on the phylogenetic tree, indicating that they most probably represent PKSs responsible for different functions.
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Affiliation(s)
- Ali Atoui
- Département Bioprocédés et Systèmes Microbiens, Laboratoire de Génie Chimique UMR5503 (CNRS/INPT/UPS), Ecole Nationale Supérieure Agronomique de Toulouse, Institut National Polytechnique de Toulouse, France
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